Ever since iPhoneOS (now iOS) has been released, there's an old fight going on about how multitasking should work on personal computers, and more specially what should happen to applications which are put in the background. Some advocate that they should be dipped in virtual liquid nitrogen and stop doing anything, like on iOS, which others advocate that they should continue to run in the background, like on desktop OSs. What about putting a little more flexibility in there?

Those apps that pass the approval process, can run in the background just like IOS system apps.

Those that don't... can't.

Such approval processes have a tendency not to scale very well when the platform becomes successful, among other issues (who approves ? based on which criteria ?), so I think that they should only be used in extreme situations...